Drill-bit



A. McG. GLEASON. DRILL BIT.

APPLICATION FILED JULY 13. 1920.

L 1,360,209. Patented Nov. 23, 1920.

FIE I 'FILLE- PATENT OFFICE.

AMILTON MGGARVEY GLEASON, 0F BELGHER, LOUISIANA.

DRILL-BIT.

Specification of Letters Patent.

Patented Nov. 23, 1920.

Application filed July 13, 1920. Serial No. 395,972.

To all whom it may concern:

Be it known that I, AMILToN MoG. GLEA- SON, a citizen of the United States, residing at Belcher, in the parish of Caddo and State of Louisiana, have invented certain new and useful Improvements in Drill-Bits, of which the following is a specification.

This invention relates to bits for drilling wells and other similar holes in the earth; and it consists of a supporting block pro vided with adjustable cutters as hereinafter fully described and claimed.

In the drawings, Figure 1 is a front view of a drill bit constructed according to this invention. Fig. 2 is a side view of the same. Fig. 3 is a detail view showing one of the bolt holes in the supporting block.

A rectangular supporting block 5 is provided, and it has a screwthreaded shank 6 or other suitable fastening device at its upper part for connecting it with the drill rod. The bl0ck5 has a tongue 7 at its lower part the bottom end 8 of which is beveled. A beveled shoulder 9 is formed on the block at the upper end of the tongue, and overlaps the tongue, and the end 8 is beveled in the same direction as the shoulder 9.

Two similar cutting blades 10 and 12 are Erovided, and are formed right and left.

ach cutting blade has a drilling edge 14 upon one side, at its bottom, and it has a shdpulder 15 at the upper part of the opposite s1 e.

The cutting blades have tongues 16 on their other end portions from their cutting edges, and these tongues are arranged to overlap the tongue 7 of the block 5. The

' outer sides of these blades and their tongues are arranged flush with the sides of the block 5, and the shoulders 15 and tongues 16 of the blades are beveled to correspond with and engage with the similar beveled portions on the block 5.

A guide groove 18 is formed crosswise in the middle part of the tongue 7 of the block 5, and the tongues 16 of the cutting blades have projections 19 which engage with the said groove. The cutting blades are secured to the supporting block by bolts 20, and in order that the cutting blades may be adjusted laterally the bolt holes 21 in the tongues 7 are elongated.

The cutting blades are set at different distances apart to vary the size of the hole which is drilled by the bit. The beveled portions on the block and cutting blades relieve the fastening bolts of much of the strain when the bit is rotated to drill a hole or well.

The cutting blades can be removed and replaced as often as necessary, and the bit is found to be very eflicacious for use in drilling wells.

What I claim is:

1. A drill bit, comprising a supporting block having a tongue 011 one side, two cutting blades formed right and left and provided with tongues which overlap the tongue of the said block, and fastening devices which secure the tongues of the blades to the tongue of the block.

2. A drill bit, comprising a supporting block having a tongue on one side, two cutting blades formed right and left and provided with tongues which overlap the tongue of the said block, the said tongues of the block and blades being provided with beveled end portions and the said block and blades having beveled shoulders which overlap and engage with the said beveled end portions, and fastening devices which secure the tongues of the blades to the tongue of the block.

3. A drill bit, comprising a supporting block having a tongue on one side, two cutting blades formed right and left and provided with tongues which overlap the tongue of the said block, the said tongues of the cutting blades and block being provided at their middle parts with grooves and projections which extend crosswise of them and which engage with each other, and fasteningdevices which secure the tongues of the blades to thetongue of the block.

4. A drill bit, comprising a supporting block having a tongue on one side, two adj ustable cutting bladesformed right and left and provided with tongues which overlap the tongue of the said block, said blades being adjustable crosswise of the block to enable them to drill holes of difierent diameters, and fastening devices which secure the blade; to the block after they have been aduste In testimony whereof I have afiixed my signature.

HILTON IcGARVl-ZY GLEASON. 

